to give (a person or thing) a title, right, or claim to something; furnish with grounds for laying claim

Merriam-Webster is similar;

1: to give a title to : designate
2: to furnish with proper grounds for seeking or claiming something this ticket entitles the bearer to free admission

And neither has the modern meaning at all.

But I’m slightly horrified to find that the built-in dictionary in MacOS only has the modern meaning:

adjective
believing oneself to be inherently deserving of privileges or special treatment: kids who feel so entitled and think the world will revolve around them

It’s interesting, though, that its definition of entitle is similar to the two web-based ones. And Cambridge has both. It seems the difference is whether you use the verb or the adjective. The latter is the only one with the modern meaning.

Language changes, and that’s fine. But I wish that people who use it in the modern fashion understood what it is they’re saying, and what it can sound like they’re saying. I suspect they mostly don’t.

They’re behaving like they’re entitled to make words mean whatever they want.